A man who experiences sudden blindness on witnessing the death of his wife is probably suffering from a conversion disorder type of paraphilia panic disorder psychosis dissociative identity

The answer is " conversion disorder".

Conversion disorder is a psychological condition in which a man has visual deficiency, loss of motion, or different sensory system side effects that can't be clarified by medicinal assessment. Its symptoms may happen in view of a mental conflict. People who have this issue are not making up their indications.